- Safety & Security Systems & Consultants, Plainville
- Sales & Marketing Consultant, Plainville
- Sales & Order Books, Plainville
- Sand Gravel & Aggregate, Plainville
- Sandblasting, Plainville - General Contractors
- Sandwich Shop Restaurants, Plainville
- Satellite Communication Downlinking & Uplinking, Plainville
- Satellite TV Service, Plainville
- Scholarships Grants & Financial Assistance Information, Plainville
- Science & Research, Plainville
- Scientific & Laboratory Equipment & Instruments, Plainville
- Scientific Equipment & Services, Plainville
- Scientific Services, Plainville
- Scrap & Waste Machinery, Plainville
- Scrap & Waste Materials, Plainville
- Screen Houses, Plainville
- Screen Printing, Plainville
- Seafood Restaurants, Plainville
- Sealants Retail, Plainville
- Secondary Schools, Plainville
- Security & Surveillance System & Equipment, Plainville
- Security Alarm Systems - Home & Business, Plainville
- Security Brokers & Dealers, Plainville
- Security Consultants, Plainville
- Security Control Systems & Monitoring, Plainville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Plainville
- Septic Tank Installation & Repair, Plainville - Septic Systems
- Septic Tank Pumping & Cleaning, Plainville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Plainville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Plainville - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Plainville
- Sheet Metal Contractors, Plainville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Plainville
- Shoe Stores, Plainville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Plainville
- Siding Contractors, Plainville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Sightseeing Tours, Plainville
- Signs, Plainville
- Snacks & Desserts, Plainville
- Snow Removal Services, Plainville - Snow Plow Service
- Social & Human Services Autism Services, Plainville
- Social Services & Welfare, Plainville
- Soil Testing Labs, Plainville - Concrete Testing
- Special Interest Schools Or Instruction, Plainville
- Specialty Stores, Plainville
- Sporting Goods Stores, Plainville
- Sports Medicine, Plainville - Doctors, Physicians & Surgeons
- Sportswear Clothing Stores, Plainville - Sports Clothes
- Springs Coil Flat - Industrial Supply & Equipment, Plainville
- Springs Coil Flat Etcetera Manufacturers, Plainville
- Staffing & Support Services, Plainville
- Staircases Stairs & Railings, Plainville
- Stationery & Office Supplies, Plainville
- Steak House Restaurants, Plainville
- Steel Fabrications Specialties, Plainville
- Steel Manufacturers, Plainville
- Steel Springs Manufacturers Except Wire, Plainville
- Stereo, Audio & Video Equipment Dealers & Stores, Plainville
- Stone, Plainville
- Store Fixtures, Plainville
- Store Fronts, Plainville - Storefront
- Stoves & Furnace Equipment, Plainville - Fittings & Repair Parts
- Structural Engineer, Plainville
- Suicide Prevention Service & Counseling, Plainville
- Surgical Supplies & Equipment, Plainville
- Surgical Supplies, Instruments, Tools & Equipment, Plainville
- Surveyor Services, Plainville - Surveying Service
- Sushi Restaurants, Plainville
- Swimming Pool, Sauna & Spa Contractors, Plainville
- Swimming Pools Contractors, Plainville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Plainville
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